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Unusual elliptical chain ring

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This is from a Feb. 1898 The Wheel :

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The Durham product takes it name from founder of the enterprise Roger Durham.

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Darren -

You have done an outstanding job with the description and images of your friend's item but have not told us if it's dentition is intended for 1/8" or for 3/32" chaine.

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Nice to see so much interesting info on this subject! Cheers people!
 
Very nice @Andrew Gorman, please don't turn it into a clock!
What age do you think yours is?
I'm seeing 52 teeth on there, do you measure these things as you would a conventional chainring?
What cranks would it fit?
Here's a vintage twin ring example....
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